#include <Key.h>

unsigned char Key_Read()
{
	unsigned char temp=0;
	P44=0;P42=1;P35=1;P34=1;
	if(P33==0)temp=4;
	if(P32==0)temp=5;
	if(P31==0)temp=6;
	if(P30==0)temp=7;
	P44=1;P42=0;P35=1;P34=1;
	if(P33==0)temp=8;
	if(P32==0)temp=9;
	if(P31==0)temp=10;
	if(P30==0)temp=11;
	P44=1;P42=1;P35=0;P34=1;
	if(P33==0)temp=12;
	if(P32==0)temp=13;
	if(P31==0)temp=14;
	if(P30==0)temp=15;
	P44=1;P42=1;P35=1;P34=0;
	if(P33==0)temp=16;
	if(P32==0)temp=17;
	if(P31==0)temp=18;
	if(P30==0)temp=19;
	return temp;
}